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merge sort. sorting elemnts of an array using merge sort algorithm

变分模态分解在信号分解精度和噪声鲁棒性方面具有明显优势，但需预先确定模态数K，而目前K 只能靠先验知识进行预估，如果预估的K 与实际信号存在差异，会导致分解误差较大。针对以上问题，利用EMD 不需预先设定模态数的自适应分解特点，通过对EMD 分解结果的分析，进行VMD 分解模态数的估计，并通过仿真信号分析及滚动轴承故障信息提取(Variational modal decomposition has obvious advantages in signal decomposition accuracy and noise robustness, but it is necessary to determine the modal number K in advance. At present, K can only be predicted by a priori knowledge. If the estimated K exists with the actual signal Differences, will lead to greater decomposition error. In order to solve the above problems, EMD is used to analyze the decomposition results of EMD without pre-setting the adaptive decomposition of modal number. The estimation of VMD decomposition mode is carried out and analyzed by simulation signal and rolling bearing fault information extraction)

之前在开发系统时整理的一些开发文档，分享给大家~(System before finishing in the development of a number of development documents, share with us ~)

这是TI官方提供的关于ZigBee协议栈中的NWK层的代码分析，正在学习ZigBee的朋友可以好好看看，很有用的！(This is the official information provided on the TI ZigBee NWK layer protocol stack code in the analysis of ZigBee' s friends are learning to be a good look, very useful!)

Sample 89C51 All basic comunication.

simulation thesis pmsm hall sensors matlab simulink foc dtc dtc-svm calculator theta speeb pdf

说明：  MFC简体中文帮助(MSDN),MFC简体中文帮助(MSDN)(MFC Simplified Chinese help (MSDN))

一个简单的学生选课系统 从代码到报告都全的 下载即可用(Students a simple elective system from the code to download the entire report can be used)

TVP5150有些隐藏的寄存器的介绍，相当有用。其他文档里没有这些寄存器的介绍。(TVP5150 some hidden registers introduction very useful. There is no other documentation of the introduction of these registers.)

自己搭建的MATLAB-SIMULINK环境下的级联多电平逆变器基本单元 包括自己搭建的触发电路(MATLAB-SIMULINK environment to build their own cascade multi-level inverter basic unit includes a trigger circuit to build their own)